如图站在�前运动的汽车上的人用手推车车对手的力为f车对脚的静�擦力为f′下列说法正确的是 A.车匀速运动时f和f′所做的总功为零 B Template




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tomski如图站在�前运动的汽车上的人用手推车车对手的力为f车对脚的静�擦力为f′下列说法正确的是 a.车匀速运动时f和f′所做的总功为零 b coloring